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Condensate drain trap question:
I had my AC replaced today. A very fine job. This has nothing to do with the installation.
I own in a over 55 development built in 1982 with 240 one floor units. The condenser is in the middle of the house in a closet and the drain runs 20' under the floor to the outside. When we bought the place in 2005, I noticed that there were two condensate drains coming from under the slab to the outside but only one ever shows condensate. I never thought much about it until today when the installer was talking about the drain backing up and the safety switch that would shut down the unit. Old system blows the water out, the new one does something else. Blah Blah. Being a Licensed Master plumber and having a keen understanding of traps and their function, it occurred to me that the traps were inverted and the trap dip was above the outlet. I asked the installer about it and he was clueless as to what I was talking about. I told him that if the horizontal 1" PVC pipe was pitched under the floor slab and drained to the outside, that is the ell on the end faced UP, with two other closely spaced ells like a plumbing trap, the whole line under the floor became part of the trap and would fill with water. He said it wouldn't. Every unit (all 240 of them) are drained like this. There are a lot of funny things in Florida but what the? He said that the line would drain, that it wouldn't fill up with water. Last Summer when I had it serviced, he sucked a large amount of nasty water out of the drain outside.